Dickenmessgeraet (Thickness Measuring Device) - suitable for mechanical thread inspection, form checking, and machine-repair clearance checks. Blade-steel probe ensures durability and accurate readings. Kegellineal (Cone Ruler) - features an optical calibration scale for deeper, crisper measurements and clear weld-seam assessment. Rohrmonteur-spalt (Pipe Fitter Gap Gauge) - sizes and graduations engraved on the surface for quick reading; includes a contour gauge function to reference shapes and gaps. Fuehlerlehrensatz (Interchangeable Pin Gauge Set) - made from high-quality material; includes practical mounting wedges for secure use. Key benefits - Clear, readable measurements with engraved scales and robust probes - Versatile: thread inspection, form checks, contour/gap verification, and mounting support - Durable materials designed for workshop and field use Use scenarios - Pre-assembly quality checks in a workshop: verify thread dimensions and component form to prevent misfit. - On-site machine maintenance: confirm clearances and alignment before reassembly. - Pipe fitting and welding projects: reference contours and weld-seam readings to ensure proper fit. This four-piece set delivers reliable inspection and alignment capabilities with durable construction and clear readability, suitable for mechanical engineering, maintenance, and pipe-fitting tasks.